Publications of Gert von Helden

Dahlmann, F., C.E. Griesbach, A.Y. Torres-Boy, G.von Helden, M.W. Peczuh, K. Pagel and K. Greis: Direct Experimental Characterization of a Sialyl Cation. Chemistry – A European Journal 31 (7), e202403724 (2025).

Seo, J., D. Kim, S. Gewinner, W. Schöllkopf, M.T. Bowers, K. Pagel and G.von Helden: Infrared multiple photon dissociation spectroscopy of protonated amino acid clusters with non-interacting side chains in the gas phase. International Journal of Mass Spectrometry 508, 117394 (2025).

Torres-Boy, A.Y., M. Taccone, K. Ober, M.B.T. Osenton, G. Meijer, G.von Helden and B. Martínez-Haya: Spectroscopic investigation of proton bonding at sub-kelvin temperatures. Physical Chemistry Chemical Physics 27 (4), 1990–2000 (2025).

Safferthal, M., K. Greis, R. Chang, C.-W. Chang, W. Hoffmann, G. Meijer, G.von Helden and K. Pagel: The impact of side-chain fluorination on proton-bound phenylalanine dimers: a cryogenic infrared spectroscopic study. Physical Chemistry Chemical Physics 26 (44), 28155–28160 (2024).

Chang, C.-W., K. Greis, G.R.D. Prabhu, D. Wehner, C. Kirschbaum, K. Ober, A.Y. Torres-Boy, S. Leichnitz, G. Meijer, G.von Helden, P.H. Seeberger and K. Pagel: Mechanistic insight into benzylidene-directed glycosylation reactions using cryogenic infrared spectroscopy. Nature Synthesis 3, 1377–1384 (2024).

Kirschbaum, C., K. Greis, S. Gewinner, W. Schöllkopf, G. Meijer, G.von Helden, K. Pagel and L.H. Urner: Structure and Conformation Determine Gas-Phase Infrared Spectra of Detergents. ChemPlusChem 89 (10), e202400340 (2024).

Meijer, G. and G.von Helden: Metal Monoxide Abundances as a Function of the C/O Ratio. ACS Earth and Space Chemistry 8 (9), 1690–1692 (2024).

Jara-Toro, R.A., M.I. Taccone, J. Dezalay, J.A. Noble, G.von Helden and G.A. Pino: Observation of a core-excited dipole-bound state ∼1 eV above the electron detachment threshold in cryogenically cooled acetylacetonate. The Journal of Chemical Physics 161 (8), 084305 (2024).

Kirschbaum, C., K. Greis, A.Y. Torres-Boy, J. Riedel, S. Gewinner, W. Schöllkopf, G. Meijer, G.von Helden and K. Pagel: Studying the Intrinsic Reactivity of Chromanes by Gas-Phase Infrared Spectroscopy. Journal of the American Society for Mass Spectrometry 35 (8), 1950–1958 (2024).

Torres-Boy, A.Y., M. Taccone, C. Kirschbaum, K. Ober, T. Stein, G. Meijer and G.von Helden: Investigation of the Proton-Bound Dimer of Dihydrogen Phosphate and Formate Using Infrared Spectroscopy in Helium Droplets. The Journal of Physical Chemistry A, in press.

Greis, K., C. Kirschbaum, K. Ober, M. Taccone, A.Y. Torres-Boy, G. Meijer, K. Pagel and G.von Helden: Infrared Spectroscopy of Fluorenyl Cations at Cryogenic Temperatures. The Journal of Physical Chemistry Letters 14 (50), 11313–11317 (2023).

Safferthal, M., K. Greis, R. Chang, C. Kirschbaum, W. Hoffmann, G. Meijer, G.von Helden and K. Pagel: Cryogenic infrared spectroscopy reveals remarkably short NH⁺⋯F hydrogen bonds in fluorinated phenylalanines. Physical Chemistry Chemical Physics 25 (36), 24783–24788 (2023).

Lettow, M., K. Greis, E. Mucha, T.R. Lambeth, M. Yaman, V. Kontodimas, C. Manz, W. Hoffmann, G. Meijer, R.R. Julian, G.von Helden, M.R. Marianski and K. Pagel: Decoding the Fucose Migration Product during Mass-Spectrometric Analysis of Blood Group Epitopes. Angewandte Chemie International Edition 62 (24), e202302883 (2023).

Greis, K., C.E. Griesbach, C. Kirschbaum, G. Meijer, G.von Helden, K. Pagel and M.W. Peczuh: Characterization and Fate of a Septanosyl Ferrier Cation in the Gas and Solution Phases. The Journal of Organic Chemistry 88 (9), 5543–5553 (2023).

Taccone, M., D. Thomas, K. Ober, S. Gewinner, W. Schöllkopf, G. Meijer and G.von Helden: Infrared action spectroscopy of the deprotonated formic acid trimer, trapped in helium nanodroplets. Physical Chemistry Chemical Physics 25 (15), 10907–10916 (2023).

Riedel, J., M. Lettow, M. Grabarics, M. Götze, R.L. Miller, G.-J. Boons, G. Meijer, G.von Helden, G.P. Szekeres and K. Pagel: Predicting Structural Motifs of Glycosaminoglycans using Cryogenic Infrared Spectroscopy and Random Forest. Journal of the American Chemical Society 145 (14), 7859–7868 (2023).

Kirschbaum, C., R.S.E. Young, K. Greis, J.P. Menzel, S. Gewinner, W. Schöllkopf, G. Meijer, G.von Helden, T. Causon, V.R. Narreddula, B.L.J. Poad, S.J. Blanksby and K. Pagel: Establishing carbon-carbon double bond position and configuration in unsaturated fatty acids by gas-phase infrared spectroscopy. Chemical Science 14 (10), 2518–2527 (2023).

Greis, K., S. Leichnitz, C. Kirschbaum, C.-W. Chang, M.-H. Lin, G. Meijer, G.von Helden, P.H. Seeberger and K. Pagel: The Influence of the Electron Density in Acyl Protecting Groups on the Selectivity of Galactose Formation. Journal of the American Chemical Society 144 (44), 20258–20266 (2022).

Kirschbaum, C., K. Greis, S. Gewinner, W. Schöllkopf, G. Meijer, G.von Helden and K. Pagel: Cryogenic infrared spectroscopy provides mechanistic insight into the fragmentation of phospholipid silver adducts. Analytical and Bioanalytical Chemistry 414 (18), 5275–5285 (2022).

Greis, K., C. Kirschbaum, M. Taccone, M. Götze, S. Gewinner, W. Schöllkopf, G. Meijer, G.von Helden and K. Pagel: Studying the Key Intermediate of RNA Autohydrolysis by Cryogenic Gas-Phase Infrared Spectroscopy. Angewandte Chemie International Edition 61 (19), e202115481 (2022).